Recent Posts
No posts yet.
 

Considering a career in industry? The oil and gas industry? In Exploration? Maybe Production? Perhaps Planning? This presentation of the Top Ten Tips for Working in Industry was developed during my 34 year career working for Mobil and ExxonMobil as a technical professional, supervisor, manager, and researcher. I’ll use examples and stories from my career, working with foreign governments in Azerbaijan and Kazakhstan, working in Mobil’s Headquarters in Fairfax, Virginia, being a supervisor and manager in exploration, and working as a senior research associate in ExxonMobil’s Upstream Research Company, recruiting for ExxonMobil at top American Universities interviewing students; and working as the Planning Manager, in Mobil’s Norwegian Affiliate in Stavanger, Norway. All of my experiences over the past 34 years have taught me how to be a successful in these fields, and I enjoy sharing these lessons with others who may be considering careers in the oil and gas industry.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/dl-marsha-french-my-top-ten-tips-for-working-in-industry-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true My Top Ten Tips for Working in Industry: Lessons Learned Over My 30-Plus-Year Career Working in Oil and Gas Exploration, Production, Planning and Research
 

Authigenic quartz overgrowths are the most common pore-occluding mineral in deeply buried (>2500 m) quartzose sandstones. But, deeply buried reservoirs of this kind in the North Sea contain more porosity than expected when the influence of authigenic microcrystalline quartz (microquartz, or the good quartz) is ignored. However, we know relatively little about the nature and origin of this porosity-preserving microquartz, which inhibits the bad and ugly quartz overgrowths from growing and occluding pores. Therefore, advanced analytical techniques have been utilized to improve our understanding of the controls on microquartz development in several examples where porosity is preserved in these and similar sandstone reservoirs.

In this study, several advanced analytical techniques were used to evaluate the crystallographic and compositional controls on the formation of microquartz. SEM/Cathodoluminescence (CL) confirms that (bad and ugly) quartz overgrowths have a complex growth history. Electron Backscatter Diffraction (EBSD) combined with Wavelength Dispersive Spectrometry (WDS) confirmed and elaborated on the complex growth history: the complex banding visible in CL is not due to changes in crystallographic orientation but more likely variations in quartz composition associated with changes in pore fluid composition and/or reservoir conditions. Finally, Secondary Ion Mass Spectrometry (SIMS) analysis provides oxygen isotope data providing insight into those initial reservoir conditions and temperature of formation of microcrystalline quartz.

Integrating the results from these advanced analytical techniques has developed an understanding of the processes controlling the formation of porosity-preserving microquartz and improved our ability to reconstruct the reservoir diagenetic history of microquartz growth leading to a proposed model for predicting porosity preservation in deep, hot sandstone reservoirs.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/dl-marsha-french-authigenic-quartz-the-good-the-bad-the-ugly-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Authigenic Quartz: The Good, The Bad, and the Ugly: Developing a Model for Preserving Porosity in Deep, Hot Sandstone Reservoirs
 

The summer of 2017 is the summer for AAPG and the Visiting Geoscientist Program! Each Tuesday and Thursday, beginning 6 June, join Visiting Geoscientist Fred Schroeder for a one-hour live webinar. The series follows a two-semester course designed and developed by Schroeder to instruct students on the basics of geology and geophysics in the petroleum industry.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/2017-VGP-Webinar-Series-Blog-Hero.png?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Visiting Geoscientist Fred Schroeder presents live every Tuesday and Thursday Free Summer Webinar Series Begins 6 June
 

Offshore opportunities from Aruba to the Falkand Islands have national and independent companies keeping their eye on Latin America.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/offshore-exploration-a-bright-spot-for-latin-america-e-and-p-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Offshore Exploration a Bright Spot for Latin America E&P
 

The driving forces for conventional accumulations (structural or stratigraphic traps) are Forces of Buoyancy which are due to differences in densities of hydrocarbons and water. In contrast, the driving forces for unconventional tight accumulations are Forces of Expulsion which are produced by high pressures. That is an enormous difference and creates unconventional petroleum systems that are characterized by very different and distinctive characteristics. The Force of Expulsion pressures are created by the significant increase in volume when any of the three main kerogen types are converted to hydrocarbons. At those conversion times in the burial history, the rocks are already sufficiently tight so the large volumes of generated hydrocarbons cannot efficiently escape through the existing tight pore system, thus creating a permeability bottleneck that produces an overpressured compartment over a large area corresponding to the proper thermal oil and gas maturities for that basin. The forces initially created in these source rocks can only go limited distances into adjacent tight reservoirs (clastics or carbonates) above or below the source. The exact distance will vary depending on the pressure increase, matrix permeability, and fractures of that specific tight reservoir system. In general, the distances are small, in the orders of 10s to 100s of feet for oil and larger for more mobile gas systems. Those exact distance numbers are subject to ongoing investigations.  

A plot of the pressure data versus elevation for a given formation is critical in determining whether an accumulation is conventional or unconventional. Conventional accumulations will have hydrocarbon columns of 10s to 100s of feet with the pressure in the hydrocarbons and that in the water equal at the bottom of the accumulation (at the HC-water contact). In contrast, the unconventional accumulations will show HC column heights of 1000s of feet with the pressure in the hydrocarbon phase and the water phase being the same at the top of the accumulation (at the updip transition zone). Those significant differences are critical for understanding and differentiating these two play types. Because the system is a pore throat bottleneck with very little or minimum lateral migration, the type of hydrocarbon s are closely tied to the thermal maturity required to generate those hydrocarbons. Thus the play concept begins with two important geochemical considerations: (1) where are the source rocks and what are the kerogen types and organic richness (TOC), and (2 ) where are they mature in the basin for oil, condensate, and gas in the basin. These parameters will very quickly define the fairway for the play. Then one has to add the critical information on the reservoirs themselves: composition (brittleness), thickness, and reservoir quality (matrix porosity and permeability). In summary, these tight unconventional petroleum systems (1) are dynamic , and (2) create a regionally inverted petroleum system with water over oil over condensate over gas for source rocks wit h Type I or II kerogen types.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/sd-Our-Current-Working-Model-for-Unconventional-Tight-Petroleum-Systems-Oil-and-Gas-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Our Current Working Model for Unconventional Tight Petroleum Systems: Oil and Gas
 

Don't get left behind! Drones and drone-derived digital data are the hottest growth areas around. Combine your geoscience knowledge with new technology, both on the data acquisition side (fly that drone!) and in the project design and data interpretation (make high-powered maps and see what no one else has seen!).

AAPG is offering two courses and a two-day GTW to equip you with practical knowledge you can leverage into a great new career opportunity.

Combining a workshop with two courses is a great way to expand your knowledge and save time in your already hectic schedule."The New Opportunities with Drones: New Needs, FAA Rule Changes, New Technologies" workshop brings together experts, equipment providers, robotics experts, and others knowledgeable in a wide range of commercial drone usage, which includes monitoring in the oil industry, digital outcrop surveying, safety and security monitoring, utility inspection, real estate, agriculture, construction, environmental protection, and more.

"Working with Drone Data 101" short course, is beneficial to anyone interested in learning more about Unmanned Aerial Systems (UAS) and how they can play a part in mapping and information services. Drones are used in the oil and gas industry from upstream to downstream, and in many other industries.

The second course, "Use of Surface Geochemistry in Petroleum Exploration" is a one day discussion of the use of surface geochemistry in petroleum exploration for conventional production. This course will help utilize an additional tool in the toolbox to find conventional oil and gas in mature to unexploited basins.

Show more American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/Drones-and-Surface-Digital-Data-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true AAPG Short Courses and Workshop — All in Houston, TX | November 29-30 and December 1-2, 2016 Drones and Surface Digital Data: 2 Short Courses + a GTW = Expanded Career Opportunities
 

The discovery processes of four provinces in southeast Mexico were forged through different political, economic and legal frameworks, imprinted indelibly by the history of Mexico.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/unifying-threads-of-southeast-mexicos-discovery-processes-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Unifying Threads of Southeast Mexico's Discovery Processes
 

Mexico, the locale for this month’s AAPG/SEG 2016 International Conference and Exhibition, is a land of enormous untapped hydrocarbon potential, as AAPG Past President Paul Weimer explains.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/mexico-a-land-of-untapped-potential-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Mexico: A Land of Untapped Potential
 

Carbonate reservoir evaluations for either Exploration or Production studies are markedly different than those for clastic ones because of several important factors:

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/abstract-carbonate-vs-clastic-reservoir-eveluations.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Carbonate vs. Clastic Reservoir Evaluations - Why So Different?
 

Heterogeneity in carbonate reservoirs contributes to large ranges in hydrocarbon production rates. Reservoir heterogeneity is generated by processes related to deposition, diagenesis and structuring.

American Association of Petroleum Geologists (AAPG)
Desktop /Portals/0/PackFlashItemImages/WebReady/abstract-carbonate-vs-clastic-reservoir-eveluations.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Predicting Patterns of Hydrocarbon Production Rates in Carbonate Fields – Deconvolving Flow-Modifying Effects of Depositional, Diagenetic and Structuring Processes
In-Person Training
Marrakech Morocco 03 November, 2017 04 November, 2017 41272 Desktop /Portals/0/PackFlashItemImages/WebReady/gtw-afr-the-paleozoic-hydrocarbon-potential-of-north-africa-past-lessons-and-future-potential-2017-17apr17-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Structure, Geochemistry and Basin Modeling, Sedimentology and Stratigraphy, Geophysics, Engineering, Compressional Systems, Tectonics (General), Extensional Systems, Source Rock, Petroleum Systems, Thermal History, Sequence Stratigraphy, Clastics, Development and Operations, Production, Structural Traps, Deep Basin Gas, Stratigraphic Traps, Conventional Sandstones, Infill Drilling
 
Marrakech, Morocco
3-4 November 2017

Location: Atlas; Anti-Atlas of Marrakech and Ouarzazate areas of Morocco**
Field Trip Leader: Abdallah Aitsalem (ONHYM) & Lahcen Boutib (ONHYM)
Field Trip Fee: USD575 *

* Field trip pricing covers accommodation, feeding and transportation for the duration of the Trip. Seats are limited and will be confirmed on a first come first served basis.

Day 1 Departure from Marrakech to Ouarzazate

The Atlas Mountains of Marrakech extend more than 250 km East-West and 50 km North-South. They record the highest mountainous peaks in North Africa with altitudes exceeding 4,000 meters (Toubkal 4,165m and Ouenkrim 4,089m). Northward and southward, they rise hundreds of meters above the Marrakech plain (Haouz plain) and Imini syncline, respectively. The recently incised mountain valleys, created during the last inversion of the Atlas, form the crossing ways of the massif, as is the case of the main road that connects Marrakech to Ouarzazate passing via the Tizi n'Tichka Pass. They also provide the opportunity to view multiple breathtaking landscapes and contain outcrops that shed light on the geological evolution of the mountain from the Precambrian to the present. Day 1 of the field trip will allow participants to view Paleozoic outcrops through the Tizi n'Tichka Pass, which displays a complete Cambrian to Devonian succession and contains several organic-rich intervals. Mesozoic and Cenozoic deposits, which are exposed on the borders of the massif, will also be viewed briefly.

Day 2: Departure from Ouarzazate to Tazzarine and back to Ouarzazate **

Day 2 of the field trip crosses the central Anti-Atlas Paleozoic basin and offers spectacular views of the largest oasis in North Africa, along the Draa River, and its majestic ancient Kasbahs. Participants will examine formations ranging in age from Upper Precambrian to Silurian. Discussions will focus on the evolution of their various depositional environments in relation to sea level changes. The well exposed sandstone formations provide the opportunity to view major Paleozoic reservoirsintervals, as well as the organic-rich "hot shales" that source these reservoirs. Rubble from recent water wells and ingenious sub-cropping irrigation systems (Khattara) provide the chance to sample fresh Ordovician and Silurian organic-rich and fossiliferous black shales. In addition, the participants will have perspective views of gentle folding generated during the Hercynian compression and related regional fractures.

Field trip route map
Field trip route map

**Field trip will end in Ouarzazate. All participants to arrange their own transport from Ouarzazate following the conclusion of the field trip.

To register for the field trip please click here.

Marrakech Morocco 01 November, 2017 04 November, 2017 37903 Desktop /Portals/0/PackFlashItemImages/WebReady/gtw-afr-the-paleozoic-hydrocarbon-potential-of-north-africa-past-lessons-and-future-potential-2017-17apr17-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true Engineering, Development and Operations, Production, Infill Drilling, Geochemistry and Basin Modeling, Petroleum Systems, Source Rock, Thermal History, Geophysics, Clastics, Sedimentology and Stratigraphy, Conventional Sandstones, Sequence Stratigraphy, Structure, Compressional Systems, Extensional Systems, Tectonics (General), Deep Basin Gas, Stratigraphic Traps, Structural Traps
 
Marrakech, Morocco
1-4 November 2017

This workshop provides the opportunity to learn and discuss the latest knowledge, techniques & technologies applied to petroleum reservoirs in the Paleozoic of North Africa which can be utilized to explore for and develop these reservoirs. The workshop will provide a set-up for networking, interacting & sharing expertise with fellow petroleum scientists interested in developing and producing hydrocarbon resources within the Paleozoic of North Africa.

Online Training
14 February, 3000 14 February, 3000 7817 Desktop /Portals/0/PackFlashItemImages/WebReady/oc-es-generic-hero.jpg?width=100&height=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true
 
Request a Visit
 

Authigenic quartz overgrowths are the most common pore-occluding mineral in deeply buried (>2500 m) quartzose sandstones. But, deeply buried reservoirs of this kind in the North Sea contain more porosity than expected when the influence of authigenic microcrystalline quartz (microquartz, or the good quartz) is ignored. However, we know relatively little about the nature and origin of this porosity-preserving microquartz, which inhibits the bad and ugly quartz overgrowths from growing and occluding pores. Therefore, advanced analytical techniques have been utilized to improve our understanding of the controls on microquartz development in several examples where porosity is preserved in these and similar sandstone reservoirs.

In this study, several advanced analytical techniques were used to evaluate the crystallographic and compositional controls on the formation of microquartz. SEM/Cathodoluminescence (CL) confirms that (bad and ugly) quartz overgrowths have a complex growth history. Electron Backscatter Diffraction (EBSD) combined with Wavelength Dispersive Spectrometry (WDS) confirmed and elaborated on the complex growth history: the complex banding visible in CL is not due to changes in crystallographic orientation but more likely variations in quartz composition associated with changes in pore fluid composition and/or reservoir conditions. Finally, Secondary Ion Mass Spectrometry (SIMS) analysis provides oxygen isotope data providing insight into those initial reservoir conditions and temperature of formation of microcrystalline quartz.

Integrating the results from these advanced analytical techniques has developed an understanding of the processes controlling the formation of porosity-preserving microquartz and improved our ability to reconstruct the reservoir diagenetic history of microquartz growth leading to a proposed model for predicting porosity preservation in deep, hot sandstone reservoirs.

Show more

Request a visit from Marsha French!

Desktop /Portals/0/PackFlashItemImages/WebReady/dl-marsha-french-authigenic-quartz-the-good-the-bad-the-ugly-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true

Related Interests

See Also ...